Fluid / Particle Interaction
 

Hi! I have a (hopefully trivial, at leat for someone out there) problem: I am trying to simulate the acceleration of abrasive particles (garnet) in a high velocity fluid stream. I have a pressure in- and outlet and a surface particle injection (fluid/particle interaction switched on). The problem is: After iteration, the particles have in every position exactly the same speed as the fluid, so that they appear not to have any inertia. What am I doing wrong? Thanks in advance, Alex

Re: Fluid / Particle Interaction
 

hi i think u should try the fluid inlet and a solid inlet(high density fluid in eulerian- eulerian grannular model ) instead of the surface particle injection. that may help u . beacuse in surface particle injection solid behave as inerts. so they acuire same velocity as that of fliud.

Re: Fluid / Particle Interaction
 

Have you turn on gravity ( a must)?

What is the density of your particles?, if small, inertial effects are not present.

Is your particle tracking in unsteady state?

Have you tried particle-flow interaction?

All these factors have an impact on the behavior of your particle tracks. Try all of them.

Cheers

CFD Newbie

Re: Fluid / Particle Interaction
 

I am looking into moddeling a similar flow. I want to model diesel exhaust flow with very many different constiuants. is this possible in fluent. Any ideas. Thanks

Re: Fluid / Particle Interaction
 

Alex:

Your particles will have have more or less the same velocity as the fluid if the particle size and/or density is very small (in this case fluid inertia dominates the particle inertia)and if the number of particles is not large enough to consider a 2-way/4-way coupling of the multiple phases.

Also, as you would have observed, (for a 1-way coupling) the particles will follow the fluid streamlines all along unless there is any solid obstruction in their path. Hope this helps.